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Integrate new layout nodes to the framework.

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- Introduce ASLayoutNode and its subclasses.
- ASDisplayNode measures its ASLayoutNode and cache the result (ASLayout). Calculated size and position of each subnode can be retrieved from the calculated layout.
- Custom nodes need to override -layoutNodeThatFits:(CGSize) instead of -calculateSizeThatFits:(CGSize).
- Custom nodes do not need to layout its subnodes (in -layout:) anymore. ASDisplayNode can handle the job most of the time, by walking through its layout tree.
- ASCompositeNode is used to embed (display) subnodes to a node's layout. That way, each subnode will also be measured while the parent node is measuring. And the parent node knows where its subnodes are within its layout.
This commit is contained in:
Huy Nguyen
2015-05-28 20:36:55 +03:00
parent f8531f467d
commit abe98d5b09
13 changed files with 315 additions and 119 deletions
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138
AsyncDisplayKit/ASCellNode.m
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@@ -1,138 +0,0 @@
/* Copyright (c) 2014-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "ASCellNode.h"
#import <AsyncDisplayKit/_ASDisplayView.h>
#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
#import <AsyncDisplayKit/ASTextNode.h>
#pragma mark -
#pragma mark ASCellNode
@implementation ASCellNode
- (instancetype)init
{
if (!(self = [super init]))
return nil;
// use UITableViewCell defaults
_selectionStyle = UITableViewCellSelectionStyleDefault;
return self;
}
- (instancetype)initWithLayerBlock:(ASDisplayNodeLayerBlock)viewBlock
{
ASDisplayNodeAssertNotSupported();
return nil;
}
- (instancetype)initWithViewBlock:(ASDisplayNodeViewBlock)viewBlock
{
ASDisplayNodeAssertNotSupported();
return nil;
}
- (void)setLayerBacked:(BOOL)layerBacked
{
// ASRangeController expects ASCellNodes to be view-backed. (Layer-backing is supported on ASCellNode subnodes.)
ASDisplayNodeAssert(!layerBacked, @"ASCellNode does not support layer-backing.");
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeAssert([self.view isKindOfClass:_ASDisplayView.class], @"ASCellNode views must be of type _ASDisplayView");
[(_ASDisplayView *)self.view __forwardTouchesBegan:touches withEvent:event];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeAssert([self.view isKindOfClass:_ASDisplayView.class], @"ASCellNode views must be of type _ASDisplayView");
[(_ASDisplayView *)self.view __forwardTouchesMoved:touches withEvent:event];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeAssert([self.view isKindOfClass:_ASDisplayView.class], @"ASCellNode views must be of type _ASDisplayView");
[(_ASDisplayView *)self.view __forwardTouchesEnded:touches withEvent:event];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeAssert([self.view isKindOfClass:_ASDisplayView.class], @"ASCellNode views must be of type _ASDisplayView");
[(_ASDisplayView *)self.view __forwardTouchesCancelled:touches withEvent:event];
}
@end
#pragma mark -
#pragma mark ASTextCellNode
@interface ASTextCellNode () {
NSString *_text;
ASTextNode *_textNode;
}
@end
@implementation ASTextCellNode
static const CGFloat kHorizontalPadding = 15.0f;
static const CGFloat kVerticalPadding = 11.0f;
static const CGFloat kFontSize = 18.0f;
- (instancetype)init
{
if (!(self = [super init]))
return nil;
_textNode = [[ASTextNode alloc] init];
[self addSubnode:_textNode];
return self;
}
- (CGSize)calculateSizeThatFits:(CGSize)constrainedSize
{
CGSize availableSize = CGSizeMake(constrainedSize.width - 2 * kHorizontalPadding,
constrainedSize.height - 2 * kVerticalPadding);
availableSize.width = MAX(0, availableSize.width);
availableSize.height = MAX(0, availableSize.height);
CGSize textNodeSize = [_textNode measure:availableSize];
return CGSizeMake(ceilf(2 * kHorizontalPadding + textNodeSize.width),
ceilf(2 * kVerticalPadding + textNodeSize.height));
}
- (void)layout
{
_textNode.frame = CGRectInset(self.bounds, kHorizontalPadding, kVerticalPadding);
}
- (void)setText:(NSString *)text
{
if (_text == text)
return;
_text = [text copy];
_textNode.attributedString = [[NSAttributedString alloc] initWithString:_text
attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:kFontSize]}];
[self invalidateCalculatedSize];
}
@end